Bound property problem

Can the property binding in javabeans work if the bean doesnt have a "PropertyChange" method implemented in it. If yes, then how ?
Similarly, how does a bean handle the case of multiple bound properties. This question arises because, there is only one "propertyChange" method in a bean and it recieves a PropertyChangeEvent parameter. In case of multiple bound properties how does a bean know which properties propertychange event has been fired?

But this means that the property change listener has to be aware of the names of all the properties that it can bind, which is a severe limitation ! This is because , if I want to make a bean which has a property color , then it would be very difficult to make the bean so generic so that it can be bound to any bean containing a property representing a color. Unless and Until I know the name of the property of the source bean, I cannot make use of the propertyChange method of the destination bean to handle the change in property.
The problem comes when a bean has multiple properties . In that case, in it's property change method, it has to filter based on the names which are not known until runtime.

Similar Messages

What is a JavaBeans bound property ?

What is a JavaBeans bound property ?
I don't understand this concept.
It seems it have to do with the Look and Feel, to bound the model to the component or something like that?

Let me change the question:
SwingConstants.CENTER works. Why?
Doesn't "import javax.swing.*" include SwingConstants?importing in Java is not like importing in C. Import javax.swing does not include the contents of the classes in those packages to the contents of the current class. It signals that the ClassLoader should look in that package to find a specific class(es) that will be used in this class. So by doing
import javax.swing.SwingConstants;
or any other import, you are not gaining the ability to use that class's variables (or constants) or members as if they were part of your class. You are just telling the runtime environment where to look for the class.
A quick look through the Java Tutorial should do some good in understanding this. Or an explanation from someone smarter than I.

Bound Property Reference ?

hi all.
can any one tell me where i can find reference on bound property of each swing component?
i would like to know what bound properties each component has and what each property means.
i don't have money so i would appreciate free reference.
thanks in advance.

reason for wanting such a loose hanging property is
Bug or feature: TextBox can't handle null text
textBox can't cope with null text (which is a valid value in the domain) so need to adapt somehow withouth being interested in the adapter at all, so keeping it around as a field is ... polluting code

NJawin: User32 and property problems

Hi everybody, especially Vitaly Shelest ;)
I'm using latest NJawin (1.1.31) and jsdk1.4.2 for wrapping some DLLs. It works, but there are several problems:
1) When null and "" (empty strings) are passes in IDispatch property put methods for String properties, there is an exception thrown;
2) HelloJava sample from Jawin distribution won't work. It ends with
Exception in thread "main" java.lang.OutOfMemoryError: requested -627650838 bytes
It won't work with Jawin either.
It's sad, but there is no source code available for NJawin. So I experience a little bit of helplessness =(
Did anybody manage to create a window with NJawin WinAPI fuctions? Do you know any workarounds for String properties in IDispatch?
Regards,
Vladimir Kirillov
vladikir SOBAKA pochta TOCHKA ru

Hi Vladimir,
I have made a test: wrote COM server DLL with one property testString
STDMETHODIMP CnjTest::get_testString(BSTR *pVal);
STDMETHODIMP CnjTest::put_testString(BSTR newVal);and java code
import NJAWINTESTLib.InjTest;
import NJAWINTESTLib.njTest;
import com.develop.jawin.COMException;
public class jawinTest {
    public static void main(String[] args) throws COMException {
        InjTest obj = new InjTest(njTest.clsID);
        obj.settestString(new String());
        String str = obj.gettestString();
        System.exit(0);
}When the parameter in settestString is null njawin generates VARIANT type VT_NULL. This is wrong. If you want to path an empty string use new String() or "". This is equivalent to null and njawin will generate VARIANT with type VT_BSTR.
Vitaly

My front panel blanks while I use the panel bounds property

When I execute the PanelBounds property of the front panel, the panel seems to blank for a brief moment allowing me to see the desktop and then reappears. I am wondering how to prevent this behavior or approach the problem in a different way. Any ideas?
Solved!
Go to Solution.
Attachments:
fp_blanking.jpg ‏56 KB

Here is a demo version that demonstrates my issue.
Open the dummy user interface (UI.vi) and the main program (Main.vi). Run Main.vi. See how the UI flashes when changing areas of interest. I can see the desktop during the transition since the front panel blanks.
Tip: Close the front panel with Alt-F4 since it will be full screen.
Attachments:
demo2.zip ‏33 KB

Httpservice url property problem

hello everyone
I need to include non latin characters in my httpservice url property. It points to a file. (http://www.myurl.com/nonLatinCharactersInFilename.xml)And its giving me errors.
When I check the error, the url appears like so: http://www.myurl.com/??????????????????.xml
Im using these character set everywhere in the code and there are no problems except when im sending the httpservice call.
I also have same characters in the result event. and theres no prpblem with that.
Any ideas how I can include these file names in the url property? or is there another way?
In my app the user clicks a list (of file names with non latin characters) and an http service is sent to load the corresponding file to a richEditableText component.
every thing except the non latin character part works fine
any help in the right direction will be appreciated.
thanx

Hello,
I am not shure, but I think you have to use a webserver, with
a folder directing to your desktop. Then you can use something like
that:
http://localhost/Desktop.
Otherwise you can try file:///C://Documents and
Settings/[username]/Desktop/flex/...xml
I hope this will help

DateTimeConverter pattern property problem

Anyone else have a problem entering a date/time pattern using the custom editor button [...] in the Properties tab?
Every time I enter a pattern (eg. EEE, d MMM yyyy HH:mm:ss zzzz) using the pop-up custom editor (accessed by clicking the little [...] button in the Properties tab for a seleted dateTimeConverter object) the pattern property doesn't take. After clicking 'OK' in the custom editor the pattern property remains blank.
The pattern is saved if you enter it directly in the Property tab text box without using the custom editor pop up.
Is this supposed to happen?
I noticed this as I went through the 'Tutorials About Converters' at http://devservices.sun.com/premium/jscreator/standard/learning/tutorials/converters.html - specifically Example Three: Using Converters for Date and Time Formatting.
Many thanks to anyone who can explain what I am doing wrong.
Regards,
J

I put this little method into the session bean and it works well for me. I wrote it so it is in the pattern that
MySql likes for datetime.
Its handy for calling anywhere in the programme.
public String getTimeStamp(){
SimpleDateFormat formatter= new SimpleDateFormat("yy-MM-dd HH:mm:ss");
Date currentTime_1 = new Date();
String dateString = formatter.format(currentTime_1);
return dateString;
Hope this helps Phil.

OO4O 10g and VB6 Bookmark Property Problem

Hi All,
I'm facing a problem with the BookMark property. It's throwing OIP-04121 Error.
Below are the details
Controls used:
1) SSDBGrid of v3.11
2) ORADC of v10g
Code:
Private Sub gridMain_RowLoaded(ByVal Bookmark As Variant)
Dim PubHol As PUBLIC_HOLIDAY
Dim Rs As Object 'Oracle DynaSet
Set Rs = datMain.Recordset.dbClone()
Rs.Bookmark = Bookmark ' Getting OIP-04121 Error here
If Rs("year") = 0 Then
gridMain.Columns(1).text = "----"
Else
gridMain.ColText(1) = Rs("year")
End If
The code is working fine in VB3.0, OO4O 1.0 and Sheridan Data Widgets 1.0e. However it's throwing error with VB6, OO4O latest versions and Sheridan Data Widgets 3.11.
Please help me I tried many ways but failed. Kindly provide some alternate way to achieve this BookMark.
Thanks and Regards,

Hi All,
I'm facing a problem with the BookMark property. It's throwing OIP-04121 Error.
Below are the details
Controls used:
1) SSDBGrid of v3.11
2) ORADC of v10g
Code:
Private Sub gridMain_RowLoaded(ByVal Bookmark As Variant)
Dim PubHol As PUBLIC_HOLIDAY
Dim Rs As Object 'Oracle DynaSet
Set Rs = datMain.Recordset.dbClone()
Rs.Bookmark = Bookmark ' Getting OIP-04121 Error here
If Rs("year") = 0 Then
gridMain.Columns(1).text = "----"
Else
gridMain.ColText(1) = Rs("year")
End If
The code is working fine in VB3.0, OO4O 1.0 and Sheridan Data Widgets 1.0e. However it's throwing error with VB6, OO4O latest versions and Sheridan Data Widgets 3.11.
Please help me I tried many ways but failed. Kindly provide some alternate way to achieve this BookMark.
Thanks and Regards,

Component binding property problem

following problem:
I have a form where I built a dataTable with a dynamic number of columns. To achieve this, I used a component binding (backing bean) to dynamically add columns.
The form is used for different kind of queries and every query has it's own number of columns. The query-identification is submitted via a request parameter.
All the data in the query-form are o.k. (bean values) but the backing bean will not be called in case of a new request (same jsf-form, but other request-parameter).
example:
http://host/url.faces?id=1
http://host/url.faces?id=2
<h:dataTable id="test"
             value="#{test.values}"
             var="i"
             rendered="true"
             binding="#{test.table}">
</h:dataTable>whereas test is a bean which is created in a servlet listener and also updated with the corresponding id from the request.
The table-property depends on the id given in the request.
why ?

ok, I found out, that using the <h:commandLink> with a param-tag solves this issue.
Now the backing-bean's method to build the table is all-time called.
And it works even after an expired session.
But unfortunately I do not really know, why it works this way and the other it doesn't...

Object drawing poorly aligned bounding box problem

Whenever I draw a shape with Object Drawing turned on the blue bounding box that appears whenever it is selected isn't aligned properly to the outer edgers of the shape. Like this:
Admittedly it isn't a major problem it's just a bit irritating especially when people I'm teaching to use Flash ask me why it looks the way it does.
Does anyone else have this problem?
Does anyone know if it can be fixed?

Hi Jen,
I'm most grateful for your response!
I am running Flash CS4 10.0.2 on a 2.4GB Mac OS X 10.5, MacBook Pro with 4GB RAM.
Following your reply, I tried a new AS2 file - and there is absolutely no issue! Its fine. How odd!
However, the problem occurs in all AS3 files - if I create a new Flash AS 3.0 file and draw on the stage, the problem occurs for the following shapes:
1. Rectangle tool
2. Ellipse tool
3. Polygon Tool
Rectangle primitive and Ellipse primitive are fine.
The smaller the object is, the more the bounding box is out of alignment. I have attached a further screengrab to show how bad things get when zoomed in working on small shapes (zoomed to 800%). Its completely unusable in object mode. The fact that the primitive shapes work is good, but the ellipses can be a bit unreliable in their shape. I've been trying to skin some detailed Flex components, but just can't work like this, so its been very frustrating.
I have really no idea where to start. I tried to re-install from the CS4 Web Premium DVDs, but as luck would have it, my SuperDrive has packed up and I have to wait for a week at the Apple Store before dropping it in to get fixed, so can't do that for now.
Cheers,
raff

Classpath and property problem in services

Hi, all,
I've had a number of problems getting the Stockquote example to run properly. This seems to be due to a problem that services don't get either classpaths or properties when they start.
The first manifestation of this problem came when the proxySet, proxyHost, and proxyPort environment variables weren't getting set properly in class services.stockquote.Stockquote. The symptom was that url.openStream () timed out because the proxy was not set correctly.
The second symptom comes when"JavaPort" is used as the port on the client. Despite every attempt I've made to put services.stockquote.Stockquote on the classpath, URLClassLoader will not find this class. However, a call to Class.forName("services.stockquote.Stockquote") in Main.java, just before the bottom of the stack, works! It works in both the client and the server!
So, could someone please tell me why the classpath and properties are getting shucked, and how to get them right?
I'm on Windows 2000 :p using JDK 1.3.1 and Tomcat 4.0.
Thanks,
- Steve.

Vivek, I think this belongs in a different thread. Also you'll need to say what problems you're having.
The only thing that definitely needs to be changed about the example is that the service may fail if it's run behind a proxy server. You'll need to set the following System properties:
System.setProperty("proxySet", "true");
System.setProperty("proxyHost", "your.proxy.com");
System.setProperty("proxyPort", <your proxy port>");
If this isn't done you'll get an exception like the following:
Exception in thread "main" com.ibm.wsif.WSIFException: SOAP Fault:SOAP-ENV:Server Exception from service object: Operation timed out: connect
-S.

JSF/Spring integration - managed-property problem

I am using JSF 1.1_01 (MyFaces 1.1), Spring 1.2, Ajax4Jsf.
The JSF application has h:selectOneMenu .
On change event of h:selectOneMenu sets "selectedValue" into backing bean as shown below:
page.jsp
<h:selectOneMenu value="#{test.selectedDevice}" >
<f:selectItem itemValue="0" itemLabel="--New--"/>
<f:selectItem itemValue="1" itemLabel="WorkStation"/>
<f:selectItem itemValue="2" itemLabel="Router"/>
<f:selectItem itemValue="3" itemLabel="Switch"/>
<ajax:support action="#{test.loadDevice}" event="onchange" reRender="t2,t3,t4,t5"/>
</h:selectOneMenu>
TestBean.java (Backing Bean)
public String getSelectedDevice() {
logger.info(" *** In getSelectedDevice *** ");
if (selectedDevice == null) {
selectedDevice = "0"; // This will be the default selected item.
return selectedDevice;
public void setSelectedDevice(String selectedDevice) {
logger.info(" *** In setSelectedDevice *** ");
this.selectedDevice = selectedDevice;
Here are the configuration file snippets for integrating JSF Spring
web.xml
<listener>
<listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
faces-config.xml
<application>
<variable-resolver>org.springframework.web.jsf.DelegatingVariableResolver</variable-resolver>
</application>
<managed-bean>
<managed-bean-name>test</managed-bean-name>
<managed-bean-class>test.TestBean</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
<managed-property>
<property-name>deviceManager</property-name>
<property-class> test.DeviceTypeManager </property-class>
<value>#{deviceManager}</value>
</managed-property>
</managed-bean>
The above code results in the following error
javax.faces.FacesException: Cannot get value for expression '#{test.selectedDevice}'
The error occurs only if i include <managed-property> inside the <managed-bean> in faces-config.xml.
The moment i remove <managed-property> from face-config.xml the error disappears & page gets rendered properly.
The purpose in having <managed-property> inside managed-bean is to call Spring's Manager class (i.e. deviceManager) from JSF application
Any pointers/suggestions in resolving the error will be highly appreciated
Regards
Bansi

The TestBean have a property for DeviceManager along with setter/getter methods as shown below. Sorry for not including in earlier posting
TestBean.java (Backing Bean)
private DeviceTypeManager deviceManager;
public DeviceTypeManager getDeviceManager() {
return deviceManager;
public void setDeviceManager(DeviceTypeManager deviceManager) {
this.deviceManager = deviceManager;
Here are the two scenarios
Scenario 1 : without <managed-property> the code works fine
Scenario 2 : with <managed-property> the code results in following error
javax.faces.FacesException: Cannot get value for expression '#{test.selectedDevice}'
Scenario 1 has only JSF whereas Scenario 2 has JSF-Spring integration
The Scenario 1 works absolutely fine as the expression '#{test.selectedDevice}' gets its value from setter/getter method in the backing bean(TestBean.java) . This is expected behaviour & wondering why it doesn't work similarly in Scenario 2 instead it complains
Cannot get value for expression '#{test.selectedDevice}'
I am willing to upload the war file. Any pointers/suggestions in resolving the error will be highly appreciated
Regards
Bansi

ONETIME_WHERE property problem

Hi ALL,
Forms 10g 10.1.2.0.2 and Win-XP sp2
I have a form , on it's When-new-form-instance trigger i wrote this code
Set_Block_Property('jourhead',ORDER_BY,'VOCH_NO');
Set_Block_Property('jourhead',DEFAULT_WHERE,'IDENT='||V_IDENT);
Where :
VOCH_NO is a varchar2 text item
v_ident is a number variable
I have a button in this form, i wrote this code for When-button-pressed trigger
Set_Block_Property ('JOURHEAD',ONETIME_WHERE,'VOCH_NO='||''''||V_PREV_record||'''');
EXECUTE_QUERY;
This code works fine but sometimes the form freezes at the line (execute_query)
Note, The form doesn't freeze if i wrote this line like this :
Set_Block_Property ('JOURHEAD',ONETIME_WHERE,'VOCH_NO='||V_PREV_record);
But this is not the case, it doesn't give the required result.
What is wrong in this code ?
Please help
Thanks
Message was edited by:
Mostafa Abolaynain

Hi Ade,
Before set item property the value is displayed right , and sometimes the form freezes before displaying the message (this may be for the same record).
Ade i noticed a very strange behaviour :
the following syntax freezes the form :
Set_Block_Property('JOURHEAD',DEFAULT_WHERE,' IDENT= '||FV.V_IDENT);
Set_Block_Property('JOURHEAD',ONETIME_WHERE,'VOCH_NO='||''''||V_PREV_record||'''');
However the following syntax doesn't freeze the form :
Set_Block_Property('JOURHEAD',ONETIME_WHERE,'VOCH_NO'||'='||''''||V_PREV_record||''''||' AND IDENT='||FV.V_IDENT);
Aren't the two syntax the same ??
I confused .

Property Problem

Can you tell me why I am getting an error message in my
Nproj.mxml file? This is an mxml/class project. I get the same
error #1120: Access of undefined property myProduct. I get it seven
times from these seven lines. What is wrong with myProduct?
myProduct.setQuantity(3);
myProduct.setPrice(2.99);
myProduct.setDesc("Teddy Bear");
trace(myProduct.getDesc());
trace(myProduct.getPrice());
trace(myProduct.getQuantity());
trace(myProduct.getTotal());
The class is listed in the file folder: Nproj/Product.as.
This is my file, Nproj.mxml.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:Script>
<![CDATA[
import Product;
var myProduct = new Product();
myProduct.setQuantity(3);
myProduct.setPrice(2.99);
myProduct.setDesc("Teddy Bear");
trace(myProduct.getDesc());
trace(myProduct.getPrice());
trace(myProduct.getQuantity());
trace(myProduct.getTotal());
]]>
</mx:Script>
</mx:Application>
This is my actionscript class, Product.as.
package
class Product {
//Instance Variables
private var price:Number;
private var desc:String;
private var quantity:Number;
function Product() {
function getPrice():Number {
return price;
function setPrice(myVar:Number):void {
price = myVar;
function getQuantity():Number {
return quantity;
function setQuantity(quantity:Number):void {
this.quantity = quantity;
function getDesc():String {
return desc;
function setDesc(myVar:String):void {
desc = myVar;
function getTotal():Number {
return price*quantity;
Thanks,
BudHud

Probably because you haven't set any access levels for your
class or your setters and getters.
it should be:
public class Product
public function getPrice():Number
public function setPrice(myVar:Number):void
and so on.
Also, although it's not required, try to do this for your
variables and functions in your application file. Like so:
private var myProduct = new Product();

Bounding box problem in InDesign CC 2014

I have a PC, am a Cloud Customer, and just upgraded to CC 2014. Have a 1000 page book finished. Went to editing. It is not broken into sections.
Don't know what happened but - Opened doc to find two pages with bounding box in center. Renamed the doc -- no difference. Deleted the two pages and tried to flow the pages back on the newly inserted pages. Works but it keeps eliminating a page so that I have to manually add in another page each time. Am only on page 140 of 1000.
What can I do?

Does this "bounding box" have really strange dimensions, written in scientific notation? There's a bug that does this on some converted files (don't think I've seen it on new files). I believe deleting the pages, complete with frames, and replacing them should get the file back on track, but the first thing you should do at that point is export IDML and resave as a new file. See Remove minor corruption by exporting

Bound property problem

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